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Editing: GifImagePlugin.py
# # The Python Imaging Library. # $Id$ # # GIF file handling # # History: # 1995-09-01 fl Created # 1996-12-14 fl Added interlace support # 1996-12-30 fl Added animation support # 1997-01-05 fl Added write support, fixed local colour map bug # 1997-02-23 fl Make sure to load raster data in getdata() # 1997-07-05 fl Support external decoder (0.4) # 1998-07-09 fl Handle all modes when saving (0.5) # 1998-07-15 fl Renamed offset attribute to avoid name clash # 2001-04-16 fl Added rewind support (seek to frame 0) (0.6) # 2001-04-17 fl Added palette optimization (0.7) # 2002-06-06 fl Added transparency support for save (0.8) # 2004-02-24 fl Disable interlacing for small images # # Copyright (c) 1997-2004 by Secret Labs AB # Copyright (c) 1995-2004 by Fredrik Lundh # # See the README file for information on usage and redistribution. # import itertools import math import os import subprocess from enum import IntEnum from . import Image, ImageChops, ImageFile, ImagePalette, ImageSequence from ._binary import i16le as i16 from ._binary import o8 from ._binary import o16le as o16 class LoadingStrategy(IntEnum): """.. versionadded:: 9.1.0""" RGB_AFTER_FIRST = 0 RGB_AFTER_DIFFERENT_PALETTE_ONLY = 1 RGB_ALWAYS = 2 #: .. versionadded:: 9.1.0 LOADING_STRATEGY = LoadingStrategy.RGB_AFTER_FIRST # -------------------------------------------------------------------- # Identify/read GIF files def _accept(prefix): return prefix[:6] in [b"GIF87a", b"GIF89a"] ## # Image plugin for GIF images. This plugin supports both GIF87 and # GIF89 images. class GifImageFile(ImageFile.ImageFile): format = "GIF" format_description = "Compuserve GIF" _close_exclusive_fp_after_loading = False global_palette = None def data(self): s = self.fp.read(1) if s and s[0]: return self.fp.read(s[0]) return None def _is_palette_needed(self, p): for i in range(0, len(p), 3): if not (i // 3 == p[i] == p[i + 1] == p[i + 2]): return True return False def _open(self): # Screen s = self.fp.read(13) if not _accept(s): msg = "not a GIF file" raise SyntaxError(msg) self.info["version"] = s[:6] self._size = i16(s, 6), i16(s, 8) self.tile = [] flags = s[10] bits = (flags & 7) + 1 if flags & 128: # get global palette self.info["background"] = s[11] # check if palette contains colour indices p = self.fp.read(3 << bits) if self._is_palette_needed(p): p = ImagePalette.raw("RGB", p) self.global_palette = self.palette = p self._fp = self.fp # FIXME: hack self.__rewind = self.fp.tell() self._n_frames = None self._is_animated = None self._seek(0) # get ready to read first frame @property def n_frames(self): if self._n_frames is None: current = self.tell() try: while True: self._seek(self.tell() + 1, False) except EOFError: self._n_frames = self.tell() + 1 self.seek(current) return self._n_frames @property def is_animated(self): if self._is_animated is None: if self._n_frames is not None: self._is_animated = self._n_frames != 1 else: current = self.tell() if current: self._is_animated = True else: try: self._seek(1, False) self._is_animated = True except EOFError: self._is_animated = False self.seek(current) return self._is_animated def seek(self, frame): if not self._seek_check(frame): return if frame < self.__frame: self.im = None self._seek(0) last_frame = self.__frame for f in range(self.__frame + 1, frame + 1): try: self._seek(f) except EOFError as e: self.seek(last_frame) msg = "no more images in GIF file" raise EOFError(msg) from e def _seek(self, frame, update_image=True): if frame == 0: # rewind self.__offset = 0 self.dispose = None self.__frame = -1 self._fp.seek(self.__rewind) self.disposal_method = 0 if "comment" in self.info: del self.info["comment"] else: # ensure that the previous frame was loaded if self.tile and update_image: self.load() if frame != self.__frame + 1: msg = f"cannot seek to frame {frame}" raise ValueError(msg) self.fp = self._fp if self.__offset: # backup to last frame self.fp.seek(self.__offset) while self.data(): pass self.__offset = 0 s = self.fp.read(1) if not s or s == b";": raise EOFError palette = None info = {} frame_transparency = None interlace = None frame_dispose_extent = None while True: if not s: s = self.fp.read(1) if not s or s == b";": break elif s == b"!": # # extensions # s = self.fp.read(1) block = self.data() if s[0] == 249: # # graphic control extension # flags = block[0] if flags & 1: frame_transparency = block[3] info["duration"] = i16(block, 1) * 10 # disposal method - find the value of bits 4 - 6 dispose_bits = 0b00011100 & flags dispose_bits = dispose_bits >> 2 if dispose_bits: # only set the dispose if it is not # unspecified. I'm not sure if this is # correct, but it seems to prevent the last # frame from looking odd for some animations self.disposal_method = dispose_bits elif s[0] == 254: # # comment extension # comment = b"" # Read this comment block while block: comment += block block = self.data() if "comment" in info: # If multiple comment blocks in frame, separate with \n info["comment"] += b"\n" + comment else: info["comment"] = comment s = None continue elif s[0] == 255 and frame == 0: # # application extension # info["extension"] = block, self.fp.tell() if block[:11] == b"NETSCAPE2.0": block = self.data() if len(block) >= 3 and block[0] == 1: self.info["loop"] = i16(block, 1) while self.data(): pass elif s == b",": # # local image # s = self.fp.read(9) # extent x0, y0 = i16(s, 0), i16(s, 2) x1, y1 = x0 + i16(s, 4), y0 + i16(s, 6) if (x1 > self.size[0] or y1 > self.size[1]) and update_image: self._size = max(x1, self.size[0]), max(y1, self.size[1]) Image._decompression_bomb_check(self._size) frame_dispose_extent = x0, y0, x1, y1 flags = s[8] interlace = (flags & 64) != 0 if flags & 128: bits = (flags & 7) + 1 p = self.fp.read(3 << bits) if self._is_palette_needed(p): palette = ImagePalette.raw("RGB", p) else: palette = False # image data bits = self.fp.read(1)[0] self.__offset = self.fp.tell() break else: pass # raise OSError, "illegal GIF tag `%x`" % s[0] s = None if interlace is None: # self._fp = None raise EOFError self.__frame = frame if not update_image: return self.tile = [] if self.dispose: self.im.paste(self.dispose, self.dispose_extent) self._frame_palette = palette if palette is not None else self.global_palette self._frame_transparency = frame_transparency if frame == 0: if self._frame_palette: if LOADING_STRATEGY == LoadingStrategy.RGB_ALWAYS: self.mode = "RGBA" if frame_transparency is not None else "RGB" else: self.mode = "P" else: self.mode = "L" if not palette and self.global_palette: from copy import copy palette = copy(self.global_palette) self.palette = palette else: if self.mode == "P": if ( LOADING_STRATEGY != LoadingStrategy.RGB_AFTER_DIFFERENT_PALETTE_ONLY or palette ): self.pyaccess = None if "transparency" in self.info: self.im.putpalettealpha(self.info["transparency"], 0) self.im = self.im.convert("RGBA", Image.Dither.FLOYDSTEINBERG) self.mode = "RGBA" del self.info["transparency"] else: self.mode = "RGB" self.im = self.im.convert("RGB", Image.Dither.FLOYDSTEINBERG) def _rgb(color): if self._frame_palette: color = tuple(self._frame_palette.palette[color * 3 : color * 3 + 3]) else: color = (color, color, color) return color self.dispose_extent = frame_dispose_extent try: if self.disposal_method < 2: # do not dispose or none specified self.dispose = None elif self.disposal_method == 2: # replace with background colour # only dispose the extent in this frame x0, y0, x1, y1 = self.dispose_extent dispose_size = (x1 - x0, y1 - y0) Image._decompression_bomb_check(dispose_size) # by convention, attempt to use transparency first dispose_mode = "P" color = self.info.get("transparency", frame_transparency) if color is not None: if self.mode in ("RGB", "RGBA"): dispose_mode = "RGBA" color = _rgb(color) + (0,) else: color = self.info.get("background", 0) if self.mode in ("RGB", "RGBA"): dispose_mode = "RGB" color = _rgb(color) self.dispose = Image.core.fill(dispose_mode, dispose_size, color) else: # replace with previous contents if self.im is not None: # only dispose the extent in this frame self.dispose = self._crop(self.im, self.dispose_extent) elif frame_transparency is not None: x0, y0, x1, y1 = self.dispose_extent dispose_size = (x1 - x0, y1 - y0) Image._decompression_bomb_check(dispose_size) dispose_mode = "P" color = frame_transparency if self.mode in ("RGB", "RGBA"): dispose_mode = "RGBA" color = _rgb(frame_transparency) + (0,) self.dispose = Image.core.fill(dispose_mode, dispose_size, color) except AttributeError: pass if interlace is not None: transparency = -1 if frame_transparency is not None: if frame == 0: if LOADING_STRATEGY != LoadingStrategy.RGB_ALWAYS: self.info["transparency"] = frame_transparency elif self.mode not in ("RGB", "RGBA"): transparency = frame_transparency self.tile = [ ( "gif", (x0, y0, x1, y1), self.__offset, (bits, interlace, transparency), ) ] if info.get("comment"): self.info["comment"] = info["comment"] for k in ["duration", "extension"]: if k in info: self.info[k] = info[k] elif k in self.info: del self.info[k] def load_prepare(self): temp_mode = "P" if self._frame_palette else "L" self._prev_im = None if self.__frame == 0: if self._frame_transparency is not None: self.im = Image.core.fill( temp_mode, self.size, self._frame_transparency ) elif self.mode in ("RGB", "RGBA"): self._prev_im = self.im if self._frame_palette: self.im = Image.core.fill("P", self.size, self._frame_transparency or 0) self.im.putpalette(*self._frame_palette.getdata()) else: self.im = None self.mode = temp_mode self._frame_palette = None super().load_prepare() def load_end(self): if self.__frame == 0: if self.mode == "P" and LOADING_STRATEGY == LoadingStrategy.RGB_ALWAYS: if self._frame_transparency is not None: self.im.putpalettealpha(self._frame_transparency, 0) self.mode = "RGBA" else: self.mode = "RGB" self.im = self.im.convert(self.mode, Image.Dither.FLOYDSTEINBERG) return if not self._prev_im: return if self._frame_transparency is not None: self.im.putpalettealpha(self._frame_transparency, 0) frame_im = self.im.convert("RGBA") else: frame_im = self.im.convert("RGB") frame_im = self._crop(frame_im, self.dispose_extent) self.im = self._prev_im self.mode = self.im.mode if frame_im.mode == "RGBA": self.im.paste(frame_im, self.dispose_extent, frame_im) else: self.im.paste(frame_im, self.dispose_extent) def tell(self): return self.__frame # -------------------------------------------------------------------- # Write GIF files RAWMODE = {"1": "L", "L": "L", "P": "P"} def _normalize_mode(im): """ Takes an image (or frame), returns an image in a mode that is appropriate for saving in a Gif. It may return the original image, or it may return an image converted to palette or 'L' mode. :param im: Image object :returns: Image object """ if im.mode in RAWMODE: im.load() return im if Image.getmodebase(im.mode) == "RGB": im = im.convert("P", palette=Image.Palette.ADAPTIVE) if im.palette.mode == "RGBA": for rgba in im.palette.colors.keys(): if rgba[3] == 0: im.info["transparency"] = im.palette.colors[rgba] break return im return im.convert("L") def _normalize_palette(im, palette, info): """ Normalizes the palette for image. - Sets the palette to the incoming palette, if provided. - Ensures that there's a palette for L mode images - Optimizes the palette if necessary/desired. :param im: Image object :param palette: bytes object containing the source palette, or .... :param info: encoderinfo :returns: Image object """ source_palette = None if palette: # a bytes palette if isinstance(palette, (bytes, bytearray, list)): source_palette = bytearray(palette[:768]) if isinstance(palette, ImagePalette.ImagePalette): source_palette = bytearray(palette.palette) if im.mode == "P": if not source_palette: source_palette = im.im.getpalette("RGB")[:768] else: # L-mode if not source_palette: source_palette = bytearray(i // 3 for i in range(768)) im.palette = ImagePalette.ImagePalette("RGB", palette=source_palette) if palette: used_palette_colors = [] for i in range(0, len(source_palette), 3): source_color = tuple(source_palette[i : i + 3]) index = im.palette.colors.get(source_color) if index in used_palette_colors: index = None used_palette_colors.append(index) for i, index in enumerate(used_palette_colors): if index is None: for j in range(len(used_palette_colors)): if j not in used_palette_colors: used_palette_colors[i] = j break im = im.remap_palette(used_palette_colors) else: used_palette_colors = _get_optimize(im, info) if used_palette_colors is not None: return im.remap_palette(used_palette_colors, source_palette) im.palette.palette = source_palette return im def _write_single_frame(im, fp, palette): im_out = _normalize_mode(im) for k, v in im_out.info.items(): im.encoderinfo.setdefault(k, v) im_out = _normalize_palette(im_out, palette, im.encoderinfo) for s in _get_global_header(im_out, im.encoderinfo): fp.write(s) # local image header flags = 0 if get_interlace(im): flags = flags | 64 _write_local_header(fp, im, (0, 0), flags) im_out.encoderconfig = (8, get_interlace(im)) ImageFile._save(im_out, fp, [("gif", (0, 0) + im.size, 0, RAWMODE[im_out.mode])]) fp.write(b"\0") # end of image data def _getbbox(base_im, im_frame): if _get_palette_bytes(im_frame) == _get_palette_bytes(base_im): delta = ImageChops.subtract_modulo(im_frame, base_im) else: delta = ImageChops.subtract_modulo( im_frame.convert("RGB"), base_im.convert("RGB") ) return delta.getbbox() def _write_multiple_frames(im, fp, palette): duration = im.encoderinfo.get("duration") disposal = im.encoderinfo.get("disposal", im.info.get("disposal")) im_frames = [] frame_count = 0 background_im = None for imSequence in itertools.chain([im], im.encoderinfo.get("append_images", [])): for im_frame in ImageSequence.Iterator(imSequence): # a copy is required here since seek can still mutate the image im_frame = _normalize_mode(im_frame.copy()) if frame_count == 0: for k, v in im_frame.info.items(): if k == "transparency": continue im.encoderinfo.setdefault(k, v) encoderinfo = im.encoderinfo.copy() im_frame = _normalize_palette(im_frame, palette, encoderinfo) if "transparency" in im_frame.info: encoderinfo.setdefault("transparency", im_frame.info["transparency"]) if isinstance(duration, (list, tuple)): encoderinfo["duration"] = duration[frame_count] elif duration is None and "duration" in im_frame.info: encoderinfo["duration"] = im_frame.info["duration"] if isinstance(disposal, (list, tuple)): encoderinfo["disposal"] = disposal[frame_count] frame_count += 1 if im_frames: # delta frame previous = im_frames[-1] bbox = _getbbox(previous["im"], im_frame) if not bbox: # This frame is identical to the previous frame if encoderinfo.get("duration"): previous["encoderinfo"]["duration"] += encoderinfo["duration"] continue if encoderinfo.get("disposal") == 2: if background_im is None: color = im.encoderinfo.get( "transparency", im.info.get("transparency", (0, 0, 0)) ) background = _get_background(im_frame, color) background_im = Image.new("P", im_frame.size, background) background_im.putpalette(im_frames[0]["im"].palette) bbox = _getbbox(background_im, im_frame) else: bbox = None im_frames.append({"im": im_frame, "bbox": bbox, "encoderinfo": encoderinfo}) if len(im_frames) > 1: for frame_data in im_frames: im_frame = frame_data["im"] if not frame_data["bbox"]: # global header for s in _get_global_header(im_frame, frame_data["encoderinfo"]): fp.write(s) offset = (0, 0) else: # compress difference if not palette: frame_data["encoderinfo"]["include_color_table"] = True im_frame = im_frame.crop(frame_data["bbox"]) offset = frame_data["bbox"][:2] _write_frame_data(fp, im_frame, offset, frame_data["encoderinfo"]) return True elif "duration" in im.encoderinfo and isinstance( im.encoderinfo["duration"], (list, tuple) ): # Since multiple frames will not be written, add together the frame durations im.encoderinfo["duration"] = sum(im.encoderinfo["duration"]) def _save_all(im, fp, filename): _save(im, fp, filename, save_all=True) def _save(im, fp, filename, save_all=False): # header if "palette" in im.encoderinfo or "palette" in im.info: palette = im.encoderinfo.get("palette", im.info.get("palette")) else: palette = None im.encoderinfo["optimize"] = im.encoderinfo.get("optimize", True) if not save_all or not _write_multiple_frames(im, fp, palette): _write_single_frame(im, fp, palette) fp.write(b";") # end of file if hasattr(fp, "flush"): fp.flush() def get_interlace(im): interlace = im.encoderinfo.get("interlace", 1) # workaround for @PIL153 if min(im.size) < 16: interlace = 0 return interlace def _write_local_header(fp, im, offset, flags): transparent_color_exists = False try: if "transparency" in im.encoderinfo: transparency = im.encoderinfo["transparency"] else: transparency = im.info["transparency"] transparency = int(transparency) except (KeyError, ValueError): pass else: # optimize the block away if transparent color is not used transparent_color_exists = True used_palette_colors = _get_optimize(im, im.encoderinfo) if used_palette_colors is not None: # adjust the transparency index after optimize try: transparency = used_palette_colors.index(transparency) except ValueError: transparent_color_exists = False if "duration" in im.encoderinfo: duration = int(im.encoderinfo["duration"] / 10) else: duration = 0 disposal = int(im.encoderinfo.get("disposal", 0)) if transparent_color_exists or duration != 0 or disposal: packed_flag = 1 if transparent_color_exists else 0 packed_flag |= disposal << 2 if not transparent_color_exists: transparency = 0 fp.write( b"!" + o8(249) # extension intro + o8(4) # length + o8(packed_flag) # packed fields + o16(duration) # duration + o8(transparency) # transparency index + o8(0) ) include_color_table = im.encoderinfo.get("include_color_table") if include_color_table: palette_bytes = _get_palette_bytes(im) color_table_size = _get_color_table_size(palette_bytes) if color_table_size: flags = flags | 128 # local color table flag flags = flags | color_table_size fp.write( b"," + o16(offset[0]) # offset + o16(offset[1]) + o16(im.size[0]) # size + o16(im.size[1]) + o8(flags) # flags ) if include_color_table and color_table_size: fp.write(_get_header_palette(palette_bytes)) fp.write(o8(8)) # bits def _save_netpbm(im, fp, filename): # Unused by default. # To use, uncomment the register_save call at the end of the file. # # If you need real GIF compression and/or RGB quantization, you # can use the external NETPBM/PBMPLUS utilities. See comments # below for information on how to enable this. tempfile = im._dump() try: with open(filename, "wb") as f: if im.mode != "RGB": subprocess.check_call( ["ppmtogif", tempfile], stdout=f, stderr=subprocess.DEVNULL ) else: # Pipe ppmquant output into ppmtogif # "ppmquant 256 %s | ppmtogif > %s" % (tempfile, filename) quant_cmd = ["ppmquant", "256", tempfile] togif_cmd = ["ppmtogif"] quant_proc = subprocess.Popen( quant_cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL ) togif_proc = subprocess.Popen( togif_cmd, stdin=quant_proc.stdout, stdout=f, stderr=subprocess.DEVNULL, ) # Allow ppmquant to receive SIGPIPE if ppmtogif exits quant_proc.stdout.close() retcode = quant_proc.wait() if retcode: raise subprocess.CalledProcessError(retcode, quant_cmd) retcode = togif_proc.wait() if retcode: raise subprocess.CalledProcessError(retcode, togif_cmd) finally: try: os.unlink(tempfile) except OSError: pass # Force optimization so that we can test performance against # cases where it took lots of memory and time previously. _FORCE_OPTIMIZE = False def _get_optimize(im, info): """ Palette optimization is a potentially expensive operation. This function determines if the palette should be optimized using some heuristics, then returns the list of palette entries in use. :param im: Image object :param info: encoderinfo :returns: list of indexes of palette entries in use, or None """ if im.mode in ("P", "L") and info and info.get("optimize", 0): # Potentially expensive operation. # The palette saves 3 bytes per color not used, but palette # lengths are restricted to 3*(2**N) bytes. Max saving would # be 768 -> 6 bytes if we went all the way down to 2 colors. # * If we're over 128 colors, we can't save any space. # * If there aren't any holes, it's not worth collapsing. # * If we have a 'large' image, the palette is in the noise. # create the new palette if not every color is used optimise = _FORCE_OPTIMIZE or im.mode == "L" if optimise or im.width * im.height < 512 * 512: # check which colors are used used_palette_colors = [] for i, count in enumerate(im.histogram()): if count: used_palette_colors.append(i) if optimise or max(used_palette_colors) >= len(used_palette_colors): return used_palette_colors num_palette_colors = len(im.palette.palette) // Image.getmodebands( im.palette.mode ) current_palette_size = 1 << (num_palette_colors - 1).bit_length() if ( # check that the palette would become smaller when saved len(used_palette_colors) <= current_palette_size // 2 # check that the palette is not already the smallest possible size and current_palette_size > 2 ): return used_palette_colors def _get_color_table_size(palette_bytes): # calculate the palette size for the header if not palette_bytes: return 0 elif len(palette_bytes) < 9: return 1 else: return math.ceil(math.log(len(palette_bytes) // 3, 2)) - 1 def _get_header_palette(palette_bytes): """ Returns the palette, null padded to the next power of 2 (*3) bytes suitable for direct inclusion in the GIF header :param palette_bytes: Unpadded palette bytes, in RGBRGB form :returns: Null padded palette """ color_table_size = _get_color_table_size(palette_bytes) # add the missing amount of bytes # the palette has to be 2<<n in size actual_target_size_diff = (2 << color_table_size) - len(palette_bytes) // 3 if actual_target_size_diff > 0: palette_bytes += o8(0) * 3 * actual_target_size_diff return palette_bytes def _get_palette_bytes(im): """ Gets the palette for inclusion in the gif header :param im: Image object :returns: Bytes, len<=768 suitable for inclusion in gif header """ return im.palette.palette def _get_background(im, info_background): background = 0 if info_background: if isinstance(info_background, tuple): # WebPImagePlugin stores an RGBA value in info["background"] # So it must be converted to the same format as GifImagePlugin's # info["background"] - a global color table index try: background = im.palette.getcolor(info_background, im) except ValueError as e: if str(e) not in ( # If all 256 colors are in use, # then there is no need for the background color "cannot allocate more than 256 colors", # Ignore non-opaque WebP background "cannot add non-opaque RGBA color to RGB palette", ): raise else: background = info_background return background def _get_global_header(im, info): """Return a list of strings representing a GIF header""" # Header Block # https://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp version = b"87a" if im.info.get("version") == b"89a" or ( info and ( "transparency" in info or "loop" in info or info.get("duration") or info.get("comment") ) ): version = b"89a" background = _get_background(im, info.get("background")) palette_bytes = _get_palette_bytes(im) color_table_size = _get_color_table_size(palette_bytes) header = [ b"GIF" # signature + version # version + o16(im.size[0]) # canvas width + o16(im.size[1]), # canvas height # Logical Screen Descriptor # size of global color table + global color table flag o8(color_table_size + 128), # packed fields # background + reserved/aspect o8(background) + o8(0), # Global Color Table _get_header_palette(palette_bytes), ] if "loop" in info: header.append( b"!" + o8(255) # extension intro + o8(11) + b"NETSCAPE2.0" + o8(3) + o8(1) + o16(info["loop"]) # number of loops + o8(0) ) if info.get("comment"): comment_block = b"!" + o8(254) # extension intro comment = info["comment"] if isinstance(comment, str): comment = comment.encode() for i in range(0, len(comment), 255): subblock = comment[i : i + 255] comment_block += o8(len(subblock)) + subblock comment_block += o8(0) header.append(comment_block) return header def _write_frame_data(fp, im_frame, offset, params): try: im_frame.encoderinfo = params # local image header _write_local_header(fp, im_frame, offset, 0) ImageFile._save( im_frame, fp, [("gif", (0, 0) + im_frame.size, 0, RAWMODE[im_frame.mode])] ) fp.write(b"\0") # end of image data finally: del im_frame.encoderinfo # -------------------------------------------------------------------- # Legacy GIF utilities def getheader(im, palette=None, info=None): """ Legacy Method to get Gif data from image. Warning:: May modify image data. :param im: Image object :param palette: bytes object containing the source palette, or .... :param info: encoderinfo :returns: tuple of(list of header items, optimized palette) """ used_palette_colors = _get_optimize(im, info) if info is None: info = {} if "background" not in info and "background" in im.info: info["background"] = im.info["background"] im_mod = _normalize_palette(im, palette, info) im.palette = im_mod.palette im.im = im_mod.im header = _get_global_header(im, info) return header, used_palette_colors def getdata(im, offset=(0, 0), **params): """ Legacy Method Return a list of strings representing this image. The first string is a local image header, the rest contains encoded image data. To specify duration, add the time in milliseconds, e.g. ``getdata(im_frame, duration=1000)`` :param im: Image object :param offset: Tuple of (x, y) pixels. Defaults to (0, 0) :param \\**params: e.g. duration or other encoder info parameters :returns: List of bytes containing GIF encoded frame data """ class Collector: data = [] def write(self, data): self.data.append(data) im.load() # make sure raster data is available fp = Collector() _write_frame_data(fp, im, offset, params) return fp.data # -------------------------------------------------------------------- # Registry Image.register_open(GifImageFile.format, GifImageFile, _accept) Image.register_save(GifImageFile.format, _save) Image.register_save_all(GifImageFile.format, _save_all) Image.register_extension(GifImageFile.format, ".gif") Image.register_mime(GifImageFile.format, "image/gif") # # Uncomment the following line if you wish to use NETPBM/PBMPLUS # instead of the built-in "uncompressed" GIF encoder # Image.register_save(GifImageFile.format, _save_netpbm)
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